What can be Determined from Colour-Colour Diagrams?

  1. Hi,

    I have a colour-colour (that is, V-R against B-V) diagram of a young open cluster, and I was wondering if anyone has any suggestions on any information that can be gleaned from such a diagram? I have searched the internet and these forums to no real avail.

    There is a clear linear line through the diagram with many stars on either side, perhaps there is a standard V-R/B-V correlation my observations can be compared against? Would it make sense to compare my diagram with that found from Landolt's data: http://brucegary.net/photometry/V-R.htm ?

    If anyone could help me begin to interpret the diagram, or provide me with a link to actual practical analysis I could utilise it would be much appreciated.

  2. jcsd
  3. Here are some links that might prove useful.

  4. You can compare them to stellar models as well as other clusters. One thing that you might be able to estimate from them is metalicity and other factors that affect the star's effective temperature. If you plot an idea blackbody on the diagram you can see how and where the temperature differs.
  5. Thankyou very much, Radrook and vociferous.
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